Device for making castings.



r H. M. DAVISON. DEVICE FOR MAKING GASTINGS. APPLICATION FILED JUNE-30, 190a.

Patented Apr. 20, 1909.

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HUGH M. DAVISON, OF HUBBARD, TEXAS.

DEVICE FOR MAKING CASTING-S.

Specifications of Letters Patent.

Patented April 20, 1909.

Application filed June 30, 1908. Serial No. 441,161.-

To all whom it may concern:

Be it known that I, HUGH'lM. DAVISON, a citizen of the United States, residing at Hubbard, in the county of Hill and State of Texas, have invented certain new and useful Improvements in Devices for Making Castings, of which the following is a specification.

This invention relates to molds or flasks for making castings of various kinds, and

more especially for makin castings for dental use; and the object 0 the invention is to provide an im roved moldin apparatus comprising 2. 11101 or flask, a tig t y fittin cover for the same, means for applying sai cover at the proper time to form a hermetic closure, and means for subjecting the molten metal within the mold or flask to pneumetic ppessure whereby it shall be forced into every sure or opening prepared for its rece tion, thus forming a very,perfect and usefu castin llVith these and other ends in View which will readily appear as the nature of the invention is better understood, the same consists in the improved construction and novel arrangement and combination of parts which will be hereinafter fully described and particularly pointed out in the claims.

In the accompanying drawing has been illustrated a sim lo and preferred form of being however, understood that no limitation is necessarily made to. the precise str'u'ptural details therein exhibited, ut that changes and alterations and modifications within the scope of the invention may be resorted to when desired.

n the drawing Figure lis a side elevation,'partly in-section of ana ilparatus constructed in accordance with t e invention. Fig. 2 is a sectional detail view taken on the plane indicated by the lines 2 2, in Fig. 1.-

Corres onding parts in both figures'are denoted like characters of reference.

A suitable base 5, is provided with upri hts 6, 6, supporting a platform7, upon w 'ch is mounted 'a vertically disposed cylinder 8. The base 5 is provided with a vertical recess or socket 9 for the reception of a shank 10 projecting downward from a vertically movable tab e 11, a coiled expansion s ring 12 bein disposed in the socket 9 elow the shan 10 and pressing upward againstthe latter, thus forcing the table 11 normally in an upright direction.

The recess 9 may be surrounded by a flange or boss-13. The table '11 supports the flask 14, which is of ordinary construction.

The platform 7 constitutes the lower head of the cylinder 8, which latter contains a pis' ton 15, the stem of which 16, through the head or platform 7 an carries a lid or cover 17 adaptedto fit tightly upon the flask 14. A spring 18 coiled upon the stem 16 engages the under side of the piston 15 and serves to force the latter normally in an upward direction. The up er end or head 19 of the cylinder 8 has an inlet nozzle 20, which is connected by a pipe or duct 21 with a suitable source of supply of compressed air, the nozzle 20 being provided with a cock or Valve 22 whereby the supply of air may be regulated, and cut ofi when desired.

The stem 16, carryin the lid 17 has a.recess or socket 23 exten ing through said lid, and it hasa nipple 24, communicating with the recess 23, and connected by a flexible pipe or duct, such as a rubber hose 25 with a similar nilpple 26 extending through the wall of the cy inder 8. The nipple 26 is located in such a position that when the lid 17 engages the ask 14, the piston L5 shall have passed downward in the cylinder 2. sufficient distance to carry it below the nipple 26, thus placin the latter in communication with the space etween said piston and the upper extremity of the cylinder.

The operation and advantages of this invention will be readily understood from the foregoing description, taken in connection with the drawing. The metal placed in the flask havin' been melted by means of the blow pipe, t e cook or valve 22 is turned so as to a mit compressed air into the upper end of the cylinder 8, thus forcin the iston 15 in a downward direction unti the id 17 carried by the piston rod en ages the flask, forming a tight closure for t e latter. The

instant the 11d engages the flask, the piston- I 5 will have been carried below the nozzle 26, thus permitting com ressed air to escape from the upper end 0 the cylinder through the duct 25 to the recess 23 inthe lower end of the pistonrod. The molten metal in the flask w1ll thus be subjected to the ressure of the compressed air, and it will be orced into one of the fissures prepared for its receptlon, thus making a very solid and perfect castin As soon as the communication with t e source of supply of compressed air is cut off from the upper end of the cylinder,

I i rojects v the piston with its related parts will be movement comes into contact with the flask,

will be avoided.

Having thus described the invention, what is claimed is;

1. In an apparatus of the class described, a vertically movable s ring sup orted flask, a vertically movable 'd for tiie same, and pneumatic means for forcing the lid in the irection of the flask.

2. In an apparatus of the class described, a vertically movable s ring supported flask, a verticallymovable id for the same, neumatic means for forcing the lid in the irection of the flask, and spring-means for restoring the lid to initial osition.

3. In an apparatus of t e class described, a

, vertically movable s ring-supported flask, a

- vertically movable id for said flask, pneumatic means for forcing the lid in the direction of the flask, and means for placing the interior of the flask in communication with a source of supply of com ressed air subseguelriitly to t e seating o the lid upon the 4. In an apparatus of the class described, a vertically movable resiliently .su ported table, a flask upon said table, a cylin er supported above the flask, as ring supported piston movable in the cylin er and having a stem carryin a lid for the flask,said stem being provi ed with a recess extending through the lid, valved means for placing the upper end of the cylinder in communication wlth a source of supply of com ressed air, and a flexible duct connecting t e cylinder with the recess in thevalve stem and the lid carried thereby, said flexible duct being connected with the wall of the cylinder at a oint which is above the piston when the atter is at the downward extremity of its movement, and the lid is seated upon the In testimony whereof I have hereto afflxed a E. JA'BVIS, B. 0. Ronnn'rs. 

